The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid
文献类型：期刊论文
| 作者 | Li, Xian; Graham, Nigel J. D.; Deng, Wensheng; Liu, Mengjie; Liu, Ting; Yu, Wenzheng
|
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2020-10-15 |
| 卷号 | 185页码:1-10 |
| ISSN号 | 0043-1354 |
| 关键词 | Fe(II) coagulation Planar-like flocs Crystalline gamma-FeOOH HA DO pH |
| 英文摘要 | Although Fe(II) salts have been widely used as coagulants in water treatment for many years, the underlying mechanisms of their performance remain unclear. Here, we present a detailed study of the coagulation behavior of Fe(II) salts and crystallization of flocs, and investigate the effect of humic acid (HA) under different DO concentrations and pH conditions. The behavior of Fe(II) and Fe(III) coagulants was found to be markedly different with the flocs from Fe(II) consisting of planar-like crystalline gamma-FeOOH in contrast to the small amorphous spherical-like flocs from Fe(III) dosing. The effect of HA on Fe(II) coagulation was different under different DO concentrations and pH, where by the growth of gamma-FeOOH was inhibited by the presence of HA, but independent of DO concentration and pH. It was found that Fe(II) was present within the internal structure of gamma-FeOOH, and a plausible formation mechanism is proposed. Firstly, planar nanoparticles of Fe(OH)(2) were formed via Fe(II) ion hydrolysis which then servedas the nucleus for subsequent crystal growth. With oxidation, Fe(II) on the surface of nanoparticles transformed to Fe(III). Finally, the formation of gamma-FeOOH in Fe(II) coagulation was accompanied by a change in solution colour to yellow. (C) 2020 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45369]  |
| 专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
| 推荐引用方式 GB/T 7714 | Li, Xian,Graham, Nigel J. D.,Deng, Wensheng,et al. The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid[J]. WATER RESEARCH,2020,185:1-10. |
| APA | Li, Xian,Graham, Nigel J. D.,Deng, Wensheng,Liu, Mengjie,Liu, Ting,&Yu, Wenzheng.(2020).The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid.WATER RESEARCH,185,1-10. |
| MLA | Li, Xian,et al."The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid".WATER RESEARCH 185(2020):1-10. |
入库方式： OAI收割
来源：生态环境研究中心
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